Is the Email HTML MJML skill free?

Yes. The skill itself is free from framix-team/skill-email-html-mjml. SkillProof publishes the install command and an independent test verdict at no cost.

What is the Email HTML MJML SkillProof Score?

9.2/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 9/10, docs & honesty 4/5.

How do I install Email HTML MJML?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use Email HTML MJML with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

Email HTML MJML

Generates and compiles MJML 4.x into cross-client-safe HTML email with real Outlook/Gmail fixes

by framix-team · framix-team/skill-email-html-mjml

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 9.2/10
Tested: Jul 14, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · c0e43a5

Compiled a real welcome-email MJML file through the documented `npx mjml --config.validationLevel=strict --config.minify=true` command and got a working, strict-mode-valid HTML file (7.3KB, well under Gmail's 102KB clip) on the first try, with alt text and mj-html-attributes ARIA roles already baked in per the skill's accessibility checklist — a hand-rolled baseline email skipped all of that.

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 5/5
Triggers reliably 5/5
Output vs. baseline 9/10
Docs & honesty 4/5

What Email HTML MJML does

Builds responsive MJML email templates (welcome, promo, transactional, newsletter) and compiles them to production HTML via the MJML CLI, applying concrete Outlook VML, Gmail 102KB-clip, iOS/Android stacking, dark-mode, and WCAG-accessibility fixes along the way. Triggers when the user asks to create/build/design an email template, compile MJML, or fix cross-client email rendering.

How to install Email HTML MJML

git clone https://github.com/framix-team/skill-email-html-mjml
cd skill-email-html-mjml
mkdir -p ~/.claude/skills
cp -r email-html-mjml ~/.claude/skills/email-html-mjml

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger Email HTML MJML

/email-html-mjml Generates and compiles MJML 4.x into cross-client-safe HTML email with real Outlook/Gmail fixes

It also activates on plain-language prompts like these:

Build me a responsive welcome email template
Compile this MJML file into HTML for our newsletter
This promo email looks broken in Outlook, fix the rendering

Frequently asked questions

Is the Email HTML MJML skill free?: Yes. The skill itself is free from framix-team/skill-email-html-mjml. SkillProof publishes the install command and an independent test verdict at no cost.
Does Email HTML MJML work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 14, 2026. Verdict: Tested · Works. Compiled a real welcome-email MJML file through the documented `npx mjml --config.validationLevel=strict --config.minify=true` command and got a working, strict-mode-valid HTML file (7.3KB, well under Gmail's 102KB clip) on the first try, with alt text and mj-html-attributes ARIA roles already baked in per the skill's accessibility checklist — a hand-rolled baseline email skipped all of that.
What is the Email HTML MJML SkillProof Score?: 9.2/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 9/10, docs & honesty 4/5.
How do I install Email HTML MJML?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use Email HTML MJML with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.